Abstract
Abstract Annual topdressings of K at 0, 42, and 166 pounds per acre, applied either in spring or mid‐summer, were compared with 2 alfalfas— Medicago sativa (var. ‘Vernal’) and M. falcata —for 3 seasons in Alaska's Tanana Valley. Stands of both alfalfas thinned rapidly during the study but stands and stand losses showed virtually no relationship to K treatments. Winterkill accounted for most of the reduction of stands and Vernal winterkilled more than M. falcata. K treatments resulted in large differences in yield. Both rates of K topdressing resulted in higher alfalfa yields than no topdressing; and 166 pounds of K per acre were superior to 42 pounds per acre. Crude protein content of forage was seldom influenced to a significant extent by K applications. Where differences existed, crude protein content was lowest with the highest rate of K application. M. falcata contained higher levels of crude protein than Vernal. K content of forage, virtually always lowest where no K was topdressed, was usually higher in alfalfa topdressed with 166 pounds of K per acre than at the lower rate. K content was lower in Vernal than in M. falcata. Highest percentage recovery in forage of applied K occurred with no topdressing. There, recovery exceeded the amount of K applied at planting. K recovery with the higher rate of topdressing was poorer than with the lower rate. M. falcata was superior to Vernal in K recovery. Amounts of available K in the soil did not differ among treatments until the third harvest season, when K levels were higher in most plots that had received the higher rate of K topdressing.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 16
Claim · model-written summary
Stands thinned rapidly but stand losses had virtually no relationship to K treatments.
- Taxon
- Medicago sativa L. and M. falcata L.
Medicago sativa subsp. falcata
Medicago sativat0 - Treatment
- K treatmentse0
- Outcome
- stands and stand lossese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stands of both alfalfas thinned rapidly during the study but stands and stand losses showed virtually no relationship to K treatments.”
t0“Medicago sativa L. and M. falcata L.”
Claim · model-written summary
Winterkill accounted for most stand reduction.
- Taxon
- Medicago sativa L. and M. falcata L.Medicago sativa subsp. falcataMedicago sativat0
- Outcome
- reduction of standse0
- Qualifier
- Winterkille0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Winterkill accounted for most of the reduction of stands”
t0“Medicago sativa L. and M. falcata L.”
Claim · model-written summary
Vernal had more winterkill than M. falcata.
- Taxon
- Medicago sativa L. and M. falcata L.Medicago sativa subsp. falcataMedicago sativat0
- Material
- Vernale0
- Outcome
- winterkillede0
- Direction
- moree0
- Comparator
- M. falcatae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vernal winterkilled more than M. falcata.”
t0“Medicago sativa L. and M. falcata L.”
Claim · model-written summary
Both potassium topdressing rates gave higher yield than no topdressing.
- Taxon
- Medicago sativa L. and M. falcata L.Medicago sativa subsp. falcataMedicago sativat0
- Treatment
- Both rates of K topdressinge0
- Outcome
- alfalfa yieldse0
- Direction
- highere0
- Comparator
- no topdressinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both rates of K topdressing resulted in higher alfalfa yields than no topdressing”
t0“Medicago sativa L. and M. falcata L.”
Claim · model-written summary
The 166 pound potassium rate outperformed the 42 pound rate for yield.
- Taxon
- Medicago sativa L. and M. falcata L.Medicago sativa subsp. falcataMedicago sativat0
- Treatment
- 166 pounds of K per acree0
- Outcome
- superiore0
- Direction
- superiore0
- Comparator
- 42 pounds per acree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“166 pounds of K per acre were superior to 42 pounds per acre.”
t0“Medicago sativa L. and M. falcata L.”
Claim · model-written summary
Potassium applications seldom significantly influenced forage crude protein.
- Taxon
- Medicago sativa L. and M. falcata L.Medicago sativa subsp. falcataMedicago sativat0
- Treatment
- K applicationse0
- Outcome
- Crude protein content of foragee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Crude protein content of forage was seldom influenced to a significant extent by K applications.”
t0“Medicago sativa L. and M. falcata L.”
Claim · model-written summary
Where crude protein differed, it was lowest at the highest K rate.
- Taxon
- Medicago sativa L. and M. falcata L.Medicago sativa subsp. falcataMedicago sativat0
- Treatment
- highest rate of K applicatione0
- Outcome
- crude protein contente0
- Direction
- loweste0
- Qualifier
- Where differences existede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Where differences existed, crude protein content was lowest with the highest rate of K application.”
t0“Medicago sativa L. and M. falcata L.”
Claim · model-written summary
M. falcata had higher crude protein than Vernal.
- Taxon
- Medicago sativa L. and M. falcata L.Medicago sativa subsp. falcataMedicago sativat0
- Material
- M. falcatae0
- Outcome
- crude proteine0
- Direction
- highere0
- Comparator
- Vernale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“M. falcata contained higher levels of crude protein than Vernal.”
t0“Medicago sativa L. and M. falcata L.”
Claim · model-written summary
Forage potassium content was virtually always lowest without potassium topdressing.
- Taxon
- Medicago sativa L. and M. falcata L.Medicago sativa subsp. falcataMedicago sativat0
- Treatment
- no K was topdressede0
- Outcome
- K content of foragee0
- Direction
- loweste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“K content of forage, virtually always lowest where no K was topdressed”
t0“Medicago sativa L. and M. falcata L.”
Claim · model-written summary
The 166 pound potassium rate usually produced higher forage K content than the lower rate.
- Taxon
- Medicago sativa L. and M. falcata L.Medicago sativa subsp. falcataMedicago sativat0
- Treatment
- 166 pounds of K per acree0
- Outcome
- highere0
- Direction
- highere0
- Comparator
- the lower ratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“was usually higher in alfalfa topdressed with 166 pounds of K per acre than at the lower rate.”
t0“Medicago sativa L. and M. falcata L.”
Claim · model-written summary
Vernal had lower K content than M. falcata.
- Taxon
- Medicago sativa L. and M. falcata L.Medicago sativa subsp. falcataMedicago sativat0
- Material
- Vernale0
- Outcome
- K contente0
- Direction
- lowere0
- Comparator
- M. falcatae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“K content was lower in Vernal than in M. falcata.”
t0“Medicago sativa L. and M. falcata L.”
Claim · model-written summary
Percentage recovery of applied K was highest with no topdressing.
- Taxon
- Medicago sativa L. and M. falcata L.Medicago sativa subsp. falcataMedicago sativat0
- Treatment
- no topdressinge0
- Outcome
- percentage recovery in forage of applied Ke0
- Direction
- Higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Highest percentage recovery in forage of applied K occurred with no topdressing.”
t0“Medicago sativa L. and M. falcata L.”
Claim · model-written summary
Without topdressing, K recovery exceeded K applied at planting.
- Taxon
- Medicago sativa L. and M. falcata L.Medicago sativa subsp. falcataMedicago sativat0
- Outcome
- recoverye0
- Direction
- exceedede0
- Comparator
- amount of K applied at plantinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There, recovery exceeded the amount of K applied at planting.”
t0“Medicago sativa L. and M. falcata L.”
Claim · model-written summary
K recovery was poorer at the higher topdressing rate.
- Taxon
- Medicago sativa L. and M. falcata L.Medicago sativa subsp. falcataMedicago sativat0
- Treatment
- higher rate of topdressinge0
- Outcome
- K recoverye0
- Direction
- poorere0
- Comparator
- the lower ratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“K recovery with the higher rate of topdressing was poorer than with the lower rate.”
t0“Medicago sativa L. and M. falcata L.”
Claim · model-written summary
M. falcata was superior to Vernal in K recovery.
- Taxon
- Medicago sativa L. and M. falcata L.Medicago sativa subsp. falcataMedicago sativat0
- Material
- M. falcatae0
- Outcome
- K recoverye0
- Direction
- superiore0
- Comparator
- Vernale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“M. falcata was superior to Vernal in K recovery.”
t0“Medicago sativa L. and M. falcata L.”
Claim · model-written summary
Soil available K first differed by treatment in the third season, with higher K in most high rate plots.
- Taxon
- Medicago sativa L. and M. falcata L.Medicago sativa subsp. falcataMedicago sativat0
- Treatment
- higher rate of K topdressinge0
- Outcome
- available K in the soile0
- Direction
- highere0
- Qualifier
- third harvest seasone0
- Comparator
- among treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Amounts of available K in the soil did not differ among treatments until the third harvest season, when K levels were higher in most plots that had received the higher rate of K topdressing.”
t0“Medicago sativa L. and M. falcata L.”
The same questions in other papers
potassium · quality: protein · Medicago sativa (alfalfa)Positive and negative results
5 in the opposite direction
- positive
- positive
- positive
2 papers more in this group
See all 6 papers →fertilization · yield · Medicago sativa (alfalfa)Positive and negative results
150 papers in the same direction as this paper · 30 in the opposite direction · 3 reporting no difference from an alternative
- negative
- no effect
- no effect
180 papers more in this group
See all 184 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.